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tmp-objdir: disable ref updates when replacing the primary odb

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When creating a subprocess with a temporary ODB, we set the
GIT_QUARANTINE_ENVIRONMENT env var to tell child Git processes not
to update refs, since the tmp-objdir may go away.

Introduce a similar mechanism for in-process temporary ODBs when
we call tmp_objdir_replace_primary_odb. Now both mechanisms set
the disable_ref_updates flag on the odb, which is queried by
the ref_transaction_prepare function.

Peff's test case [1] was invoking ref updates via the cachetextconv
setting. That particular code silently does nothing when a ref
update is forbidden. See the call to notes_cache_put in
fill_textconv where errors are ignored.

[1] https://lore.kernel.org/git/YVOn3hDsb5pnxR53@coredump.intra.peff.net/

Reported-by: Jeff King <peff@peff.net>
Signed-off-by: Neeraj Singh <neerajsi@microsoft.com>
Reviewed-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Neeraj Singh
2021-12-06 22:05:05 +00:00
committed by Junio C Hamano
parent b3cecf49ea
commit ecd81dfc79
6 changed files with 21 additions and 1 deletions
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7
object-store.h
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@ -27,6 +27,13 @@ struct object_directory {
uint32_t loose_objects_subdir_seen[8]; /* 256 bits */
struct oidtree *loose_objects_cache;
/*
* This is a temporary object store created by the tmp_objdir
* facility. Disable ref updates since the objects in the store
* might be discarded on rollback.
*/
int disable_ref_updates;
/*
* This object store is ephemeral, so there is no need to fsync.
*/